Octagonal diagnostic test device



FIG. 1 is a top perspective view of an octagonal diagnostic test device, showing our new design;

FIG. 2 is a side elevation thereof, the opposite side being a mirror image thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a top perspective view of a second embodiment of the octagonal diagnostic test device;

FIG. 6 is a side elevation thereof, the opposite side being a mirror image thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a top plan view thereof. 

The ornamental design for an octagonal diagnostic testing device, as shown and described. 